2003年8月27日：火星（Mars）近距离掠过

当太阳、地球（Earth）和火星排列成一线时，火星处于冲日位置。在冲日期间或前后，火星通常会达到与地球的最接近态（closest approach）。

When the Sun, Earth, and Mars all align so that from an earthly perspective, Mars is opposite the Sun, Mars is said to be at opposition. Mars oppositions happen about every other year, and at opposition – or rather, within a few days of it – Mars is also at its closest approach to Earth Continue reading "Aug. 27, 2003: Mars zooms in" The post Aug. 27, 2003: Mars zooms in appeared first on Astronomy Magazine .